RING-RETAINING 5P4256 - Caterpillar

Engine: G3520B (S/N: GLF1-UP)Petroleum Engine: G3520B PETROLEUM (S/N: TPC1-UP)Introduction
Note: Do not perform any procedure in this Special Instruction until you read this information and you understand this information.This Special Instruction provides the following information for G3520B Industrial Engines:
Requirements for the electrical system
Proper welding practices
Grounding procedures
Required service tools
Electrical components and electronic components
Wiring connections and the corresponding functions that are available to the customer
Initial start-up procedures
Governor adjustment proceduresReferenceInformation from the following sources will be needed for this Special Instruction:
Complete analysis of the fuel
Data from a complete fuel analysis that is entered into Caterpillar Software, LEKQ6378, "Methane Number Program"
The engine performance data sheet from the engine Technical Marketing Information (TMI) or Gas Engine Rating Pro (GERP)
Engine Operation and Maintenance Manual, SEBU7201
Systems Operation, Testing and Adjusting, KENR5412
Troubleshooting Manual, KENR5413
Schematic, KENR5929Requirements for the Electrical System
All of the wiring must conform to all of the codes that are applicable to the site. When you route the wiring, avoid acute bends and sharp edges. To protect the wiring harnesses, route the harnesses through metal conduit. A liquid tight conduit is recommended. Use proper support and alignment in order to avoid strain on the conduit.Electrical power must be supplied to the junction box that serves as the main distribution panel for the engine control system. The engine control system requires a clean 24 VDC power supply capable of supplying 30 A of continuous power.The maximum allowable AC ripple voltage is 150 mV AC peak to peak. For the wiring, the maximum allowable voltage drop is 1 VDC from the power supply to an Electronic Control Module (ECM) or to an actuator.Grounding Practices
Proper grounding is necessary for optimum engine performance and for reliability. Improper grounding will result in electrical current paths that are uncontrolled and unreliable.Uncontrolled electrical circuit paths can result in damage to main bearings, to crankshaft bearing journal surfaces, and to aluminum components. Uncontrolled electrical circuit paths can also cause electrical activity that may degrade the engine electronics and communications.
Connect all metal cases that contain electrical components or electronic components to the cylinder block with an electrical ground strap.
Do not connect the negative terminal from the electrical power supply directly to the cylinder block. Connect the negative terminal from the electrical power supply to the negative terminal "−" on the power distribution box.
Ground the cylinder block with a ground strap that is furnished by the customer. Connect this ground strap to the ground plane.
Use a separate ground strap to ground the battery negative terminal for the control system to the ground plane.
Rubber couplings may connect the steel piping of the cooling system to the radiator. The couplings cause the piping and the radiator to be electrically isolated. Ensure that the piping and the radiator are continuously grounded to the cylinder block. Use ground straps that bypass the rubber couplings.
Ensure that all grounds are secure and free of corrosion.Proper Welding Procedures
Proper welding procedures are necessary in order to avoid damage to electronic controls. Perform welding on the engine according to the following procedure.
Set the engine control